If you are using a system on which the date utility does not have a -d option (such as Solaris and OS X systems), there is no shift between standard time and daylight savings time between the two timestamps, and that the time stamps are less than 24 hours apart (with end time being on the day following start time if start time is later in the day than end time), then the following script will do what you want. I used ksh for this example, but any POSIX conforming shell will work. (Note that a traditional Bourne shell will not work, but could be made to work by using expr instead of the arithmetic expansions used in this script.)
If you save the above script in a file named secdiff, change the 1st line to include an absolute path to a POSIX conforming shell if /bin/ksh isn't an absolute pathname of the Korn shell on your system, make it executable (by running chmod +x secdiff), and run the script using:
it will give you the number of seconds between the timestamps you gave in your example. If you run the script using:
it will demonstrate that the script can handle a shift to the next day.
This User Gave Thanks to Don Cragun For This Post:
Hello,
Im writing a script using the ksh shell. I have 2 variables in the script:
CURRTIME
PREVTIME
Example, if CURRTIME=13:00, I want to somehow calculate what the time was an hour ago so that PREVTIME=12:00
Right now I have the following:
CURRTIME=`date +%H:%M`
How can I... (4 Replies)
Hello
I have a the creation date of a file stored in a variable in the following format:
Wed May 06 10:14:58 2009Is there a way I can echo the variable and display it in epoch time?
I've done a lot of searching on this topic, but haven't managed to get a solution. I'm on Solaris 10.
... (2 Replies)
i have the time 20100421043335 in format (date +%Y%m%d%H%M%S),and i want to be able to get the previous time 2 minutes ago,which is
20100421043135 (9 Replies)
need some help on the below requirement:
File1:
SV,22,20100501140000,JFK,RUH
SV,29,20100501073000,BOM,RUH
SV,29,20100501073000,SIN,RUH
third filed is datetime which is of the format (yyyymmddhh24miss)
File2
JFK,+,0500
BLR,-,0530
SIN,-,0800
for every line of file 1, take 4... (9 Replies)
Hi guys.
I am trying to subtract 10 minutes from the current Unix system date and time. I have the datecalc provided here but it is mainly the date and not the time. Please check on how can i subtract 10 minutes from the current time using datecalc or any other shell scripting that will... (2 Replies)
HI Guys,
I want to find out the script running time and subtract from sleeptime.
My Script Below Give me error :-
#!/usr/bin/ksh
timeout=100
start=$SECONDS
sleep 20
end=$SECONDS
echo "Time: $((end - start)) "
ScTime = $((end - start)) (1 Reply)
Hello all,
I have written sth like this:
#!/bin/bash
grep -e XXX -e YYYY myfile.log | grep -v ZZZ | awk '{print $1 " " $2 ";" $3 ";" $9 ";" $11}' > myfile.csv
sed -i '1iDate;Time;From;To' myfile.csv
=> it is clear that it converts log to csv and add a header.
Now I want to subtract row... (4 Replies)
Hello All,
I am working on script where I need to add hours,minutes or seconds in the time.Time is not the current but it could be future time.I thought I can store that time in variable and add hours.minutes or second but I am not able to add that in the time that is stores in a variable.
Time... (9 Replies)
the given time is:
12:13:00
how do i subtract a 10 minutes from any given time?
date '12:13:00' '-10 min'
also tried this:
date +12:13:00 '-10 min' (2 Replies)
INPUT:
16:45:51 10051 77845
16:45:51 10051 77845
16:46:52 10051 77846
16:46:53 10051 77846
Match the last PID then subtract second line time with first line.
Please help me with any command or script. (3 Replies)